# Relationship history for MSHA mine 2901860

Current hierarchy: **Buchmeier William M → Oro Mountain Mining Corp → Kings Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Smith-Yoder Resources Inc → Kings Mine; 1981-04-01 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Smith-Yoder Resources Inc → Kings Mine; 1981-04-01 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Smith-Yoder Resources Inc → Smith-Yoder Resources Inc; 1981-04-01 to 1987-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Oro Mountain Mining Corp → Kings Mine; 1987-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buchmeier William M → Kings Mine; 1987-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buchmeier William M → Oro Mountain Mining Corp; 1987-06-15 to current/open; source msha-controller-operator-history